Furnace with regenerative firing.



K. WENDT.

FURNACE WITH REGENEHATIVE FIRING.

APPLIOATION FILED DEC. 14, 1011.

Fig.1.

Patented May 26, 1914.

2 SHEBTFS-SHEET 1.

m K075 War/L066 K. WENDT.

FURNACE WITH EEGENERATIVE FIRING.

APPLICATION FILED DBG.14,1911.

Patented May 26, 191%.

' 2 $HEETSSHEET 2.

LUYM K 8Q. SEQ,

; UNITED. s'rn'rns PATENT oFFIcE.

KARL WENDT, F GEORGSMAR-IENHfiTTE, NEAR OSNALBRlj'CK, GERMANY,'ASS1IGNOR TO THE FIRM OF GEORGS-MARIEN BERGWERKS- UNI) Hll'TTEN-VEBEIN, AKTIEN- GESELLSCHAFT, OF GEORGSMARIENHTTTTE, NEAR. OSNABB'UCK, GERMANY.

FURNACE "WITH REGENERATIVE FIRING.

. Specification of Letters Patent.

Application filed December 14, 1911. Serial No. 665,755.

, specification.

' v The rolling mill furnaces used heretofore direction.

for heating ngots were constructed either as furnaces with fixed flame direction or as S emens regenerators with alternatlng flame consists in. the ingots being placed in the furnace at the front side by means of a feeding apparatus, and gradually pushed forward into the hottest zone. This gradual.

heating of the ingots is especially necessary in the case of hard-steel ingots, apart from the fact that the cinder and waste is thereby reduced. These furnaces are usually heated by grate-firing. Gas-firing can only be carried out to advantage w1th,a gas of great caloric value or in such cases where the ingetsv do not need to be subjected to great heat. The advantage of regenerative firing, on the other hand consists in it being pos- I sible to heat the furnacewith inferior gases,

apart from the fact that the attendance of such. gas-firing plants is extremely simple. They have, however, the disadvantage, in

the designs heretofore employed in which. the air-channels are arranged in the front wall of. the furnace, that the ingots require mediately introduced into the very .hot furto be placed in the furnace through the sidedoors in separate lots by means of expensivecharging apparatus, thereby being in nace without being previously warmed.

Y The object of ;the present invention is to unite the advantages of both systems in a furnace with regenerative gas firing by a novel arrangement of the burners and the feed-track. For this purpose the burners areplaced onone or b h Sides in Sole or hearth, so that the front walls remain free for the introduction of the ingots. The

. latter glide along an uncovered feed-track consisting for example of water-cooled pipes, between which the heating channels are arranged. In order to prevent the ingots being immediately subjected to great heat by the hot gases which pass out on the charging side, the heat channels near the The advantage of" the former charging door are covered with vaulted 1nasonry, sothat the ingots are warmed be fore they come into direct contact with the gases. ,The gas and air supply of the burnerson the charging side is so constructed that the completecombustion of the mixture of gas and air. only takes'place after having passed 'through a certain path in the furnace,'thus insuring the-maximum heat always at the same place, 2'. 6., near the discharge-opening. Various forms of this apparatus are shown in the drawings.

Figure 1 shows a longitudinal section'of a furnace with feed-traclr extending from end to end. Fig. 2- 'shows a section at the line 2-2 in Fig. 1. 3 shows a longitudinal section of amodified furnace with feed-track and rolling bed. Fig. 4 shows a section on the line H in Fig. 3. Fig. 5 is a section on the line 5--5 of Fig. 1; and Fig. 6 is a'sectionon the line 6-6 of Fig. 3. The index letters of all the drawings are employed for the same parts throughout.

In Figs. 1 and 2 the furnace is shown with a feed-track extending from end to end, on whichlthe ingots are pushed through the furnace a-:feeding device C. A is the charging side, 1 the feed-track wit-h cooling watenpipes. The pipes together with the feed-track o bear on the supporting walls y,

(see Fig. 2). ,between' which the channels 0, ,27, r, 8 are arranged, through'which as and air are passed in suchproportions that complete combustiontakes place and consequently the greatest heat'is developed near the discharge-opening; l

a and b are the air or gas channels on the discharge side- B, 0 and: at those on the chargesside. These channels are con ected up to the regenerative chamberse, fig and h. The channels a and Z) lead to the burner G andthe channels 0 and d tov the burner G The two burners G and G are situated in the sole or hearth.

the furnace chamber by an additional flue 2' having a port 70, through which air is admitted, thereby causing the greatest heat to be developed within .the furnace not too far from the exit B.

The heat channels 0, p, g,-1' and s are covered by protective covering of vaulted masonry at the burner G on the charge-side, so that the ingots are warmed to some ex- Patented May 26, 1914.1

The regenerator h may be connected to.

ing gases. The supply of gas and air at this point is so designed that the complete 'nels 0, 7). g, 1' and s.

combustion of the mixture of gas and air cannot take place until after a certain path:

has been traveledby the gases, in the furnace, thus insuring the greatest heat always being developed at the same point, i. e. near thedilscharge-opening B.

The process in the furnace takes place as follows :'Thegases issuing from burner G play at first on the ingots at near the discharge opening B, giving the already. thoroughly heated ingots their maximum grade of heat. After heating the same and warming the other inserted ingots m, the gases leave the furnace by passing through the vaulted masonry n through the passages into the chambers g and h. After the change in the direction of the flames, air and gas pass through the channels a and d intp the space below the vaulted masonry n and divided by the supporting walls g into the single chan- The slag formed is drawn off through the channels u and t.

In the furnace shown in Figs. 3 and 4, the feed-track 'v is connected up direct to an inclined bed w, on which the ingots m, are gradually rolled tothe discharge-opening B. In this type of furnace the discharge opening is placed at the side, and therefore the burner Gr only is necessary on one side of the sole or hearth. The burners Gr ending in the lateral channels 0 and s are hereby partially or wholly moved back into the side walls of the furnace (see Fig. 4), as in this case the feeding of the ingots from the front is not impeded. In order to secure the developmeiit of the maximum degree of heat near the discharge-opening there may also be installed additional gas and air burners suitably distributed in the sole or hearth and the sidewalls of the furnace. I

Poker bars maybe inserted in opening Z in F i 3 to assist in movin the in ots forward. The regenerator h'may also be connected to the furnace. chamber by an additional fluei having a port 71: as in Fig. 1.

What I claim as my invention and desire to secure by Uni'ted States Letters "Patcut is z- '1. A furnace having gas and air regenerators ateach end, gas and air conduits connected to said regenerators and arranged to deliver the flame 1nto the furnace at each i end and longitudinally thereof in either direction, said furnace having acharging openmg in its end wall, feed track extending from said openlng into the furnace, and a protective covering located beneath the end portion of the trackand spaced from the bottom of and extending partway into the furnace to form a longitudinal flue or flues, the gas and air cdnduits at the charging *end of the furnace connecting the regenerators at that end to such flue or flues, said flue or flues constituting the outlet for the products of combustion when the flame is reversed. I

2. A furnace having gas and air regenerators ateach end, gas and air conduits connected to said regenerators and arra-iijged to deliver the flame into the furnace and longitudinally thereof, said furnace H havin a charging opening in its end wall, a Feed track extending from saidopening into the furnace, a protective covering located beneath the charging end portion of the track and spaced from the bottom of the furnace to form a longitudinal 'flueor flues, the gas and air conduits at the charging end of the furnace connecting the regenerators at that tors at each end, gas and air conduits connected, to said regenerators and arranged to deliver the flame into the furnace at each end and longitudinally thereof ineit-h'er di-. rection, said furnace having a charging opening in one end wall, a feed track extending from said'wpeninginto the furnace,- a discharging opening, and means to deliver the flame from one end into the furnace at a point distant from said end and toward the middle of the furnace. t. A furnace having-gas and air regenerators at each end, gas and air conduits connected to said regenerators and arranged to. deliver flame into' the furnace and longitudinally thereof, said furnace having a charging opening in its end wall, a discharge opening at a distance from said charging opening, means to convey an article to be heated through said furnace and a supplementary air conduit arranged to supply a blast of air to a flame at a point along the length of said flame. Y

In testimony whereof I afiix my signature in presence of two witnesses.

, DR. KARL WENDT.

lVitnesses:

IIENRY HASPER, lVoLnnMAR HAUPT. 

